Martha Freeman worked as a reporter and teacher before becoming a full-time writer of books for young readers, including the Edgar Award–nominated Zap!, Born Curious, The Secret Cookie Club series, Who Stole Halloween?, and Effie Starr Zook Has One More Question, which School Library Journal called “accessible and exciting” in a starred review. She also collaborated with NASA astronaut Mark Kelly on the Astrotwins books. Martha lives in Oregon. Learn more at MarthaFreeman.com. Katy Wu has worked in the animated feature film industry as a sketch artist and assistant art director, as well as in the tech industry as a “Doodler” for Google (creating the artwork and short films showcased on Google’s landing page), where she created the Google “Doodles” for Nellie Bly and Nelson Mandela. Katy currently works as a freelance art director and designer on various animation projects. She has illustrated many nonfiction books for young readers, including Dumpling Dreams by Carrie Clickard and Born Curious by Martha Freeman. Learn more at KatyCWWU.Tumblr.com.